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Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
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Sim card registration failure means that the card in the phone is not being recognized by the service provider as a valid or current account. The service provider is denying service based on the sim card that you are trying to use in your phone. If you have a current and valid account with your cell phone provider then you need to contact them to remedy the problem because something in the registration process has failed. They need to update and/or correct their records to link your account to the sim card in your phone so that your service will work.

The software in your phone is corrupt and needs to be re installed.It is possible that virus has got into your system.So scan your memory card for virusand remove battery,Keep aside for thirty minutes, replace to switch on.If fault shows up,You will need to get help from Nokia Care,to be installed.

Try flashing the phone, it's easy and warranted to solve almost any problem of that kind. There are many nice tutorials on the Internet. Just be careful and remember to have full battery before attempting to flash the phone.

If it showing you that sim card registration failed then then make sure your sim card is work or not.
if your same Sim card works in different phone. it could be that your phone has been blocked by the network

I'm using NOKIA 7610 , From my application manager i close the phone app by mistake , After that my mobile is close all the app and showing NOKIA window for 10 sec and BLANK and again showing NOKIA window , Please give me the solution